This is the default tab because the <header>
tag has a class of default-tab.
Notice how the algorithm walked up the hierarchy selecting each containing tab as well.
Another way to make a tab the default is to include tabz-enable in the class
attribute of both the <header>
and it's <section>
tags.
You can also simulate a click on a tag by calling tagz.init(element)
or tagz.init(selector)
which is what this button does: